The companies are bringing the episodes to over 750 theaters nationwide on April 15, the same day as the TV airing, for “Survival Sunday: ‘The Walking Dead’ & ‘Fear the Walking Dead.'” The episodes are set to mark the first crossover between the two series.

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The in-theater experience will also include an extra half-hour of exclusive bonus content, making the screenings begin at 8:30 p.m. ET/5:30 p.m. PT instead of the on-air 9 p.m. and 6 p.m., respectively.

My prediction... negan and rick kill each other to teach the audience a lesson about letting go of hate.
That's a wild prediction though so I wouldn't bet on it

The show runner has said

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“This episode isn’t just like these 15 episodes coming to a conclusion, but Angela and myself and the writers had always talked about this in many ways being sort of the conclusion of the first eight seasons,” Gimple explained. “This show will be very much a new show next year and with a bigger, new narrative. It was something I was really excited about getting into even before season 8. And so there was just a certain weight in the air of the kind of conclusion that we were getting closer to.”